type UnknownFn = (...args: unknown[]) => unknown;
export declare class EventEmitter {
    listeners: Map<string, UnknownFn[]>;
    onceLabels: Set<string>;
    __deleteOnce(label: string): boolean;
    on(label: string, callback: UnknownFn): void;
    once(label: string, callback: UnknownFn): void;
    remove(label: string, callback: UnknownFn): void;
    emit(label: string, ...args: unknown[]): void;
}
export {};
//# sourceMappingURL=event-emitter.d.ts.map